Rated working pressure Lubricators

Technical Specifications – Rated Working Pressure Lubricators

Applications – Matching Rated Pressure to Service

Product Types – Rated Pressure Models

SJ‑LUB‑70 (70 MPa) – Standard Duty

Best for: Conventional drilling, workover rigs, cementing operations.

Key features:

• Lowest handle effort (easiest pumping at 70 MPa)

• Standard nitrile seals – compatible with most greases

• Green pressure gauge face (0–100 MPa)

• Price-optimized for fleet purchase

Typical users: Land drilling contractors, workover service companies.

SJ‑LUB‑105 (105 MPa) – Heavy Duty

Best for: Deep drilling, offshore platforms, fracturing support, choke & kill manifolds.

Key features:

• Reinforced seals for high cycle life at 105 MPa

• Yellow gauge face (0–140 MPa) with green band to 105 MPa

• Heavier construction (thicker cylinder wall)

• Also works on lower pressure valves (no harm)

Typical users: Offshore operators, deep well drillers, frac service companies.

SJ‑LUB‑140 (140 MPa) – Ultra-High Pressure

Best for: High-pressure fracturing (shale, tight gas), deep well control (15,000 psi shut-in), ultra-deep drilling.

Key features:

• PTFE-backed seals (no extrusion under 140 MPa)

• Hard chrome plated cylinder (wear resistance)

• Red gauge face (0–200 MPa) with green band to 140 MPa

• Requires moderate handle effort – hydraulic intensifier ratio optimized for 140 MPa output

Typical users: Major frac fleets, ultra-deep exploration drilling.

SJ‑CV‑LUB‑RATED – Rated Pressure Check Valve Fittings

Permanent lubricator fittings for valve bodies, available in 70, 105, and 140 MPa pressure classes.

Key features:

• Spring-loaded check valve opens at 3–5 MPa injection pressure

• Rated pressure stamped on fitting body

• Stainless steel or steel construction

• Thread sizes: 1/8″ NPT, 1/4″ NPT, or custom

Never install a 70 MPa check valve fitting on a 105 MPa valve. SJ color-codes fittings (green=70, yellow=105, red=140) to prevent mix-ups.

SJ‑PNEU‑LUB‑RATED – Pneumatic Lubricators by Pressure Class

Air-driven lubricators for high-volume operations, available in 105 MPa and 140 MPa ratings (70 MPa available on request).

Key features:

• 2–10 liter grease reservoir

• Requires 0.4–0.8 MPa air supply at 200–500 L/min

• Includes pressure regulator and filter

• Serialized with test certificate

OEM Customized Solutions – Lubricators for Non-Standard Pressure Requirements

Sometimes your valves require a pressure rating that doesn't match our standard classes. Or you need custom seals, connections, or reservoirs.

What we customize:

Custom pressure rating test protocol:

Step 1: Design to your target pressure (e.g., 120 MPa)
Step 2: Prototype fabrication
Step 3: Hydrostatic test to 1.5x target (180 MPa) – 5 minute hold
Step 4: Cyclical test – 1,000 cycles at target pressure
Step 5: Certification report with test data
Step 6: Production run

Why Choose SJ for Rated Working Pressure Lubricators?

Frequently Asked Questions (FAQ)

Q1: What does "rated working pressure” mean compared to "maximum pressure”?

A: "Maximum pressure” is often a theoretical, untested number – the pressure at which the manufacturer thinks the tool might fail. "Rated working pressure” is the safe, tested, certified pressure at which the tool is designed to operate continuously. SJ rated working pressure lubricators are hydrostatically tested at 1.5x rated pressure. We do not publish "maximum” numbers – only certified working pressures.

Q2: Can I use a 140 MPa lubricator on a 70 MPa valve?

A: Yes – safely. Higher rated pressure is fine. The lubricator will inject at whatever pressure is needed (up to 140 MPa). However, you may find the 140 MPa lubricator requires more handle effort because its intensifier is optimized for higher output. For routine 70 MPa work, use the 70 MPa model – easier on your technicians.

Q3: What happens if I use a 70 MPa lubricator on a 105 MPa valve?

A: Two problems. First, the lubricator may not generate enough pressure to overcome seat resistance – the valve won't get lubricated. Second, if it does generate 105 MPa, the 70 MPa-rated seals can extrude or burst, causing grease leakage or sudden pressure release. Do not do this.

Q4: How do I know which pressure rating my valve needs?

A: Check your valve’s nameplate for working pressure rating. Lubricator rating should be ≥ valve working pressure + 20%. Example: 70 MPa valve → 84 MPa minimum → SJ 105 MPa lubricator. If you are unsure, SJ can recommend based on valve make, model, and operating pressure.

Q5: Do you provide test certificates for each lubricator?

A: Yes – every SJ rated working pressure lubricator includes a hydrostatic test certificate with the serial number, test pressure (1.5x rated), duration, and pass/fail result. We retain test records for 10 years.

Q6: How often should I recertify a lubricator?

A: SJ recommends recertification (pressure test) every 12 months or after any major impact (dropped tool). Field recertification: connect to a pressure test pump, pressurize to 1.5x rated pressure, hold for 5 minutes. Document results. SJ can perform recertification at our service centers.

Q7: Are your lubricators compatible with [brand name] high pressure grease?

A: Yes – SJ lubricators work with all standard NLGI grade 00 to 2 greases, including lithium complex, calcium sulfonate, PTFE-loaded, and biodegradable formulations. Avoid using grease containing solid particles larger than 50 microns (can clog check valves).

Q8: What is the shelf life of a new lubricator (unused, stored properly)?

A: Indefinite for metal components. Elastomer seals degrade over time – after 5 years of storage, replace seals before use. Replacement seal kits available.

Q9: Do you offer a calibration service for pressure gauges?

A: Yes – we can recalibrate and certify pressure gauges. Alternatively, gauges are field-replaceable with standard 2.5″ diameter, 1/4″ NPT connection, glycerin-filled units from any major instrument supplier.

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